I see..Less evidence on my side so I'll drop this point.
That's not as easy as it sounds though...He has 6 at hand so I don't really agree. I also think the Kunais would be destroyed in the crossfire of the Bijuus clashing which would make things harder for Minato to just teleport. I think it would be something similar to this if he's distracted, his blindspot is completely left opened
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(SM sensing he had, Jumping prowess he had as well) . Obito doesn't need to teleport right behind him, he can teleport right above and aim at his tail ..A distracted Naruto had to be warned despite his ability to sense in this mode
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If Minato decides to use a BD on the Bijuus, Obito can also have this come up around him
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effectively having Minato attack his own self. That's not as easy to see coming up when you're faced with other Bijuus.